SSL 통신과 관련되어 좋은 정보가 있어서 소개한다.
c언어를 이용하여 SSL 통신을 java로 컨버팅한것이다. HTTPClient를 이용하면 굉장히 쉽게 사용할 수 있다.
c언어 공부용으로 발췌함~^^
출처
서버(serv.c)
/* serv.cpp - Minimal ssleay server for Unix
30.9.1996, Sampo Kellomaki <sampo@iki.fi> */
/* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
Simplified to be even more minimal
12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <openssl/rsa.h> /* SSLeay stuff */
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
/* define HOME to be dir for key and cert files... */
#define HOME "./"
/* Make these what you want for cert & key files */
#define CERTF HOME "server-req.pem"
#define KEYF HOME "server-key.pem"
#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
void main ()
{
int err;
int listen_sd;
int sd;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
size_t client_len;
SSL_CTX* ctx;
SSL* ssl;
X509* client_cert;
char* str;
char buf [4096];
SSL_METHOD *meth;
/* SSL preliminaries. We keep the certificate and key with the context. */
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
meth = TLSv1_server_method();
// create a new SSL_CTX object as framework for TLS/SSL enabled functions
ctx = SSL_CTX_new (meth);
if (!ctx) {
ERR_print_errors_fp(stderr);
exit(2);
}
if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(3);
}
if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(4);
}
if (!SSL_CTX_check_private_key(ctx)) {
fprintf(stderr,"Private key does not match the certificate public key\n");
exit(5);
}
/* Prepare TCP socket for receiving connections */
// Create Internet Socket and Fill sockaddr_in
listen_sd = socket (AF_INET, SOCK_STREAM, 0);
CHK_ERR(listen_sd, "socket");
memset (&sa_serv, '\0', sizeof(sa_serv));
sa_serv.sin_family = AF_INET;
sa_serv.sin_addr.s_addr = INADDR_ANY;
sa_serv.sin_port = htons (1111); /* Server Port number */
// Bind
err = bind(listen_sd, (struct sockaddr*) &sa_serv, sizeof (sa_serv));
CHK_ERR(err, "bind");
// Listening
err = listen (listen_sd, 5);
CHK_ERR(err, "listen");
// Accept
client_len = sizeof(sa_cli);
sd = accept (listen_sd, (struct sockaddr*) &sa_cli, &client_len);
CHK_ERR(sd, "accept");
// Close Listening socket
close (listen_sd);
// Connected-client info.
printf ("Connection from %lx, port %d\n",
sa_cli.sin_addr.s_addr, sa_cli.sin_port);
// TCP connection is ready. Do server side SSL.
// create a new SSL structure for a connection
ssl = SSL_new (ctx);
CHK_NULL(ssl);
// connect the SSL object with a file descriptor
SSL_set_fd (ssl, sd);
err = SSL_accept (ssl);
CHK_SSL(err);
// Get the cipher - opt
printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
// Get client's certificate (note: beware of dynamic allocation) - opt
client_cert = SSL_get_peer_certificate (ssl);
if (client_cert != NULL)
{
printf ("Client certificate:\n");
str = X509_NAME_oneline (X509_get_subject_name (client_cert), 0, 0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
free (str);
str = X509_NAME_oneline (X509_get_issuer_name (client_cert), 0, 0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
free (str);
/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */
X509_free (client_cert);
}
else
{
printf ("Client does not have certificate.\n");
}
// DATA EXCHANGE - Receive message and send reply.
err = SSL_read (ssl, buf, sizeof(buf) - 1);
CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);
err = SSL_write (ssl, "I hear you.", strlen("I hear you."));
CHK_SSL(err);
/* Clean up. */
close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
}
클라이언트(cli.c)
/* cli.cpp - Minimal ssleay client for Unix
30.9.1996, Sampo Kellomaki <sampo@iki.fi> */
/* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
Simplified to be even more minimal
12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */
#include <stdio.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
void print_x509(SSL *ssl)
{
char *ascii_cert;
X509 *cert = SSL_get_peer_certificate(ssl);
BIO *b;
BUF_MEM *bptr;
b = BIO_new(BIO_s_mem());
if(X509_print(b, cert) > 0)
{
BIO_get_mem_ptr(b, &bptr);
ascii_cert = (char *)malloc(1 + bptr->length);
memcpy(ascii_cert, bptr->data, bptr->length);
}
else
{
ascii_cert = (char *)malloc(1024);
sprintf(ascii_cert, "This certificate has never been seen before and can't be shown\n");
}
BIO_free(b);
/* X.509 인증서 출력 */
printf("X.509:\n%s\n", ascii_cert);
}
void main (int argc, char **argv)
{
int err;
int sd;
struct sockaddr_in sa;
SSL_CTX* ctx;
SSL* ssl;
X509* server_cert;
char* str;
char buf [4096];
char hello[80];
SSL_METHOD *meth;
printf ("Message to send: ");
fgets (hello, 80, stdin);
SSLeay_add_ssl_algorithms();
//meth = SSLv2_client_method();
meth = TLSv1_client_method();
SSL_load_error_strings();
ctx = SSL_CTX_new (meth);
CHK_NULL(ctx);
CHK_SSL(err);
///////////////////////////////////////////////////////////////////////////////////////
// Create a socket and connect to server using normal socket calls.
sd = socket (AF_INET, SOCK_STREAM, 0);
CHK_ERR(sd, "socket");
memset (&sa, '\0', sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr ("203.247.40.139"); /* Server IP */
sa.sin_port = htons (atoi(argv[1])); /* Server Port number */
// Normal-connect
err = connect(sd, (struct sockaddr*) &sa, sizeof(sa));
CHK_ERR(err, "connect");
// Now we have TCP conncetion. Start SSL negotiation.
// create a new SSL structure for a connection
ssl = SSL_new (ctx);
CHK_NULL(ssl);
// connect the SSL object with a file descriptor
SSL_set_fd (ssl, sd);
// initiate the TLS/SSL handshake with an TLS/SSL server
err = SSL_connect (ssl);
CHK_SSL(err);
/*
* Following two steps are optional and not required for
* data exchange to be successful.
*/
printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
// Get server's certificate (note: beware of dynamic allocation) - opt
server_cert = SSL_get_peer_certificate (ssl);
CHK_NULL(server_cert);
print_x509(ssl);
/*
printf ("Server certificate:\n");
str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
free (str);
str = X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
free (str);
*/
/*
* We could do all sorts of certificate verification stuff here before
* deallocating the certificate.
*/
X509_free (server_cert);
///////////////////////////////////////////////////////////////////////////////////////
// DATA EXCHANGE - Send a message and receive a reply.
//err = SSL_write (ssl, "Hello World!", strlen("Hello World!"));
//CHK_SSL(err);
err = SSL_write (ssl, hello, strlen(hello));
CHK_SSL(err);
err = SSL_read (ssl, buf, sizeof(buf) - 1);
CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);
// send SSL/TLS close_notify
SSL_shutdown (ssl);
/* Clean up. */
close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
}
서버의 개인키와 셀프 사인된 인증서 입니다. 그리고 인증서의 패스워드는 abcd 입니다.
*server-key.pem
-----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: DES-EDE3-CBC,AA26BA50E01C1524 oXXeC9GyPwvJxVyqRXROLXp5Ew5n/gS6+vpDXXSIsuE8RIk17Mtx1NpOGWxmQ/hd L9zAvDniOoavTyKyVI0VZx13A1RzptaSP1CqEBeQUlT5DU3IFhwdj8BRXfpaWrve NnCZiyvr5CNgSLg0pVvcUhI9CmQtj94bLN6KATbZ/FyQZTSkrN6kh1jBwHd04RvZ 2YvxtuzevtxvLLHOvxCxocIYnPWJzViEyuKbz/co3ywZibFXrqu2Xpgrk3lHN21M ZXWPeVJ2DzAIWMhqjpOX98w0hLHvZHVWpiO09avH/wzR7YbCKZpwFZUdjcUuzETZ OzJO3p97mf9D64KbAOmq7h6Pme8pkT/io8Qe24XyaV0C7ca67t3J3NSBVmyPNgEP MsfTctk98FfKmOXD7fm1y5k4YZ7weDuDRs09KNFxn6sm94Q5ssQmaAPNCVZTpGSW p6/sDb1dU8/2lTFFU67tquwR679h2AouF/Ea0Sa2l0o8HfcAS8YJxp77+W2qB9Zt ymkSJlvX7s5qt4oBryTOyDKVFzmzksjJHaar7tRJ00fTh+AICxxQvfzUE82oH49R +07clHW7DCh4FMevvflSujfIChVIwvwg2Vr1b63QIp8tlZ0BiPAZH8TV6cPDROVQ 5dWDQlcOrvfNsC1qI17kvn/N4ZzKyvdB4cEZh6xMH8UfFJ+qpNhJ1gwJFe9XI11z 90hSa9lsFqBBw2sGmnN9QxKC1UpdvjoZV1VTBEqGWYDR4S1lx575gm77nF9XcJAr pW7Fs9qKLWi7trWQxI0ncKQ6DGuGbh/ctebgchKe/kIA/4E0nQjTcg== -----END RSA PRIVATE KEY-----
*server-req.pem
-----BEGIN CERTIFICATE----- MIIDYjCCAsugAwIBAgIBADANBgkqhkiG9w0BAQQFADCBgzELMAkGA1UEBhMCQVUx EzARBgNVBAgTClNvbWUtU3RhdGUxDDAKBgNVBAcTA0ZvbzENMAsGA1UEChMETGFu ZDEMMAoGA1UECxMDRm9vMRYwFAYDVQQDEw1zbmFmdS5taXQuZWR1MRwwGgYJKoZI hvcNAQkBFg1mdWJvYkBtaXQuZWR1MB4XDTAwMTExMzAyMjgxMVoXDTAwMTIxMzAy MjgxMVowgYMxCzAJBgNVBAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMQwwCgYD VQQHEwNGb28xDTALBgNVBAoTBExhbmQxDDAKBgNVBAsTA0ZvbzEWMBQGA1UEAxMN c25hZnUubWl0LmVkdTEcMBoGCSqGSIb3DQEJARYNZnVib2JAbWl0LmVkdTCBnzAN BgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAtvnaO7XYscdlXoTwql5uHa5Vx1ecKZOc pSAqGQx4LnMGbRvnb+m2OxUZ3xFc8V1a2eKlUyTKoo0bebTeS5/BLBik47TjfUlw /P1hLYhIFZNb+o/g3ZeWG/9QZYs0favV+0iAoqpy/scHwHZg2Vnpjivsit543s+x uuWuD4fpUIsCAwEAAaOB4zCB4DAdBgNVHQ4EFgQUTkDDGu1osvRIZY/LlZdmRbAs rM0wgbAGA1UdIwSBqDCBpYAUTkDDGu1osvRIZY/LlZdmRbAsrM2hgYmkgYYwgYMx CzAJBgNVBAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMQwwCgYDVQQHEwNGb28x DTALBgNVBAoTBExhbmQxDDAKBgNVBAsTA0ZvbzEWMBQGA1UEAxMNc25hZnUubWl0 LmVkdTEcMBoGCSqGSIb3DQEJARYNZnVib2JAbWl0LmVkdYIBADAMBgNVHRMEBTAD AQH/MA0GCSqGSIb3DQEBBAUAA4GBAEmPUSEShK6tHGdwPUvwYwp7cR0mwRNi3peB vu5nqwjCnCFaQaUdBfh/18kT5uEpGB48A/6BImov36Aiq9cq6dVNGQkVI0y/FJ0J 28zSYrRHXGOS5qMoWRaqCabuYbDUsx/bvCr21ET948jMawdd8nq+3ungEQzlIZtO oWcmJYad -----END CERTIFICATE-----
*컴파일
# gcc -o serv serv.c -lssl -lcrypto # gcc -o serv cli.c -lssl -lcrypto
*실행
# ./serv Enter PEM pass phrase: abcd # ./cli Message to send: hello!!
이번에는 자바 클라이언트 입니다.. 여기에서 에러가 나는데.. 봐주세요..^^;
*SunSSLSocketClient.java
import java.io.*;
import java.net.*;
import java.security.*;
import javax.net.ssl.*;
public class SunSSLSocketClient {
private static final String HOST = "127.0.0.1";
private static final int PORT = 1111;
private static String [] socketProtocolVersion = new String[] {"TLSv1"};
public static void main(String [] args) throws Exception {
char [] passPhrase = "abcd1234".toCharArray();
KeyStore keystore = KeyStore.getInstance("JKS");
keystore.load(new FileInputStream(".keystore"), passPhrase);
TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
tmf.init(keystore);
SSLContext context = SSLContext.getInstance("TLS");
TrustManager [] trustManagers = tmf.getTrustManagers();
context.init(null, trustManagers, null);
SSLSocketFactory sf = context.getSocketFactory();
SSLSocket socket = (SSLSocket)sf.createSocket(HOST, PORT);
socket.setEnabledProtocols(socketProtocolVersion);
System.out.println(socket);
PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw.println("Hello!!");
String fromServer = br.readLine();
System.out.println(fromServer);
}
}
책에보니까 보통 이렇게 하더라구요.. 이렇게 코드를 작성하고 keytool을 사용해서 키저장소를 만들었습니다..
# keytool -genkey -keystore .keystore
.....
자바 클라이언트 실행
# java SunSSLSocketClient
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